Collapsible form



Feb. 5, 1929.

J. N. HELTZEL CoLLAPs I BLE FORM Filed June 6, 1924 4 Sheets-Sheet gwue'ntoz. d. N. H ELTA-1L,

61H01 new.

Feb. 5, 1929.

J. N. HELTZEL COLLAPSIBLE FORM Filed June 6, 1924 4 Sh s-Sheet 2 Feb. 5, 1929.

J. N. HELTZEL coLLAPsIBLE FORM Filed June 6, 1924 4 Shee s-Sheet FIGM F`IGJ4.

alc Srl/wanton d. N H ELTZEL,

N. HELTZEL F eb. 5, 1929.

COLLAPS I BLE FORM D t 4 E Ww M 0 5 w 1 n e h S s t e e h s 4. 8 5 5 6 e I m F L 9 1 6, 9 m E.. J .w a6 1 .l 7 F A wm a LJ.I\I.HELTZEL,

Hmmm,-

Patented Feb. 5, 1929.

UNITED STATES JOHN N. HELTzEL, or WARREN, omo.v

coLLAPsIBLE FORM.

Application led June 6,

The present invention relates to forms used in the building of concrete and similar roads and other surfacing constructions, and the primary object of the invention is the provision of means for producing a channel or void in the road when built, usually at the center line thereof, to be subsequently filled, so as to produce a flexible construction joint in the road, which may also serve as a traffic line or marker, of the kind disclosed in my copending application Serial No. 708,- 558, filed April 23, 1924.

In addition to such fundamental object. it-

is also an object of the invention to provide such a form which is convenient, 'practical and eflicient in use, and which can be collapsed or contracted for removal from the channel or void in the road.

A further object is to improve the device generally in its construction and assemblage of the component elements, to enhance the utility and efiiciency of the form.

With the foregoing and other objects in view, which will be apparent as the description proceeds, the invention resides in the construction and arrangement of' parts, as hereinafter described and claimed, it being understood that changes can be made within therscope of what is claimed, without departing from the spirit of the invention.

The invention is illustrated in the accompanving drawings, whereinl Figure 1 is a perspective v1ew of the preferred construction of the form, portions being broken away and shown in section.

Fig. 2 is a cross section on the line 2-2 of Fig. 1.

Fi 3 is a cross section on the same line as Fia'. 2, showing the top or cap plate removed and the form collapsed. p

Fig. 4 is a plan view of the form with the top plate removed and portions lshown in section. l

Fig. 5 is a fragmentary perspective view of one of the side plates or walls of the form, to show the slot therein.

Fig. 6 is a perspective View of one of the pcdestals. y

Fig. 7 is a plan view showing a modified form Vof top plate for use at curves in the road.

Fig. 8 is an enlarged cross section on the line 8 3 of Fig. 7.

Figs. 9 and 10 are cross sections showing modified constructions of forms.

Fig. 11 is a perspective View of another modified construction.

1924. Serial No. 718,376.

Fig. 12 is a perspective view showing the v stake positioning templet.

Fig. 13 is a cross section on the line 13-13 of Fig. 11.

. Fi 14 is a longitudinal vertical section on the line 121--14 of Fig. 13.

Fig. 15 is a fragmentary perspective view of still another modified construction.

Fig. 16 is a perspective view of another modification.

Fig. 17 is a cross section of a yfurther modification. l

Fig. 18 is a fragmentary perspective view of still another modified construction.

Referring to Figs. 1 to 6, inclusive, the collapsible core form de icted therein comprises the complementary s1de plates or walls 30 of suitable sheet metal, which are formed between and spaced from their upper and lower edges with the offsets 31, which, as shown, extend toward one another, and said plates are provided at their lower edges with the inturnedbase flanges 32. A top or cap plate 33 isseatable at its edges on the upper edges of the side plates 30, to close the form at the top, and prevent concrete from passing down between the side plates. Angle irons 34 are secured to the lower surface of the top late 33 to overlap the side plates 30 at'the inner surfaces thereof, for holding the top plate in position and assisting in keeping the side plates 3() spread apart.

At suitably longitudinally spaced intervals, stakes 35 are driven into the ground or subbase between rthe side plates 30 to maintain the form in position on the sub-base and to space the side plates apart. Plates 36 are riveted or otherwise secured to the stakes 35, and the side edges 37 of each plate diverge upwardly beyond the edges of the stake, so that the plate 36 provides a wedge. The edges 37 extend across and contact with the edges of the base anges 32, and strips 38 are secured to and project above the offsets 31 for the contact of the edges 37 of the wedge plate 36. United with the upper end of the plate 36 is a pair of depending prongs or secondary stakes 39 which are adapted to pass downwardly through apertures 40 in the top and bottom portions of the offsets 31 and through apertures 41 in the base flanges 32. The stake 35 and plate 36 thus provide a spacer between the side plates 30 for spacing said side plates apart and supporting or holding them in proper spaced relation. When driving the stake downwardly between the side plates,

the wedge plate 36 passes between the stri s 38 and aseflanges 32 to separate the side plates 31, and the pron s or secondary stakes 39 pass down through tle apertures 4() and 41, thereby spacing the side plates apart the predetermined distance and maintaining said side plates in proper relative position. Where the upper portions of' the prongs 39 are united with the upper end portion ofy the plate 36, hooks are formed to engage over the upper edge portions of the strips 38 which project above the offsets 31 to hold the side plates down on the base. The plate 36 being disposed between the base flanges 32 will keep the lower edges of the side plates 30 spaced apart, and said plates36 being disposed between the strips 38 will hold the upper edges of the plates 30 spaced apart, assisted by the top plate 33. The prongs 39 will also assist in preventing the side plates from moving toward or away from one another when the stakes 35 are driven down into the sub-base, said prongs 39 being of suflicient length to project below the base flanges 32 and also enter the sub-base.

The side plates 30 are connected or joined together to keep them assembled and to facilitate collapsing the form. Thus, as shown, toggle connections are used, comprising vertically spaced pairs of toggle links 42 and 43 pivoted at their opposite ends to angle pieces 44 secured to the plates 30 near their upper and lower edges. The adjaeentfends of the links 42 and 43 are pivoted together and to a vertical bar 45 whereby the upper and lower toggles can be operated simultaneously. As shown, the bar 45 projects above the upper toggle and has an aperture 46 for the engagement of an implement, such as a hand hook, or the like, used for collapsing the form. When the form is set up, the toggles are straightened out, as seen in Fig. 2, thereby assisting in spacin the side plates 30 a art, and when the top ate 33 and stakes 35 have been removed, the lbars 45 are pulled upwardl thereby breaking the toggles, as seen in IZig. 3, to pull the side plates 30 toward one another. This will collatpse the form so 'that it can be readil lifted rom the channel or void in the roa As shown, the links 43 at one side are slightly longer than the links 42 at the opposite side, so that when the form is collapsed, the base flanges 32 may overlap. This enables the side plates 30 to be moved closer together, especially when the base flan es 32 are wider than the offsets 31.

T e toggle connections are preferably located close to the stakes 35, and the top plate 33 has an opening 47 above each stake 35 and toggle connection, for access thereto. Such opening can be closed by any suitable means. As shown, the edge portion of the plate 33 surrounding the opening is offset downwardlv to form a seat 48 for a closure 49 which is flush with the upper surface of the plate 33.

In order that transverse dowel or tie rods or bars 50 can extend through the form to be embedded in the opposite sections or slabs of the road, the side plates 30 have slots 51 extending upwardly from their lower edges and through the base flanges 32 into the offsets 31. The rods 50 can be readily inserted upwardl; into said slots, and the slots also permit t e side plates 30 to be lifted from the rods 50 in removing the form. The dowel rods 50 can be located at suitable longitudinally spaced intervals.

A pedestal 52 is positioned below each rod 50, and comprises a base 53 and the uprights 54 hingedly connected with the base to snugly fit the outer surfaces of the lates 30. The upper terminals of theiprig its 54 are offset inwardly, as at 55, to fit in the offsets 31, and said terminals have notches 56 to receive the dowel rod 50. The side plates 30 are preferably provided with longitudinal slots 57 at the1r lower corners, to receive the hinges of the pedestals. The destal performs several functions. In till? first place, the base 53 is disposed under the flanges 32 of the side plates 3() so as to seat on the sub-base and assist in supporting the form. The base 53 and uprights 54 also extend across and close the slots 51, to prevent the concrete from flowing through said slots into the form. The rod 50 seating in the notches 56 will also be supported by the pedestal at the upper ends of the slots 51 in the desired horizontal position. Furthermore, the upper ends of the uprights 54 engaging under the rod 50 within the offsets 31 will prevent said uprights from being swung outwardly away from one another, and the pedestal will thereby assist in preventing the plates 30 from bein separated. However, when the form is co lapsed and removed, the uprights 54 can `be swun toward one another over the base 53, whic will permit the pedestal to be removed from between the sections or slabs of the road, so that the pcdestals, as well as the side and top plates and stakes, can be used repeatedly.

An inverted U-shaped rod or member 58 is used to assist in supporting each dowel rod 50 and for holding the top plate 33 down in place on the side plates. Said member 58 has hooks 59 at its terminals to en rage under thel dowel rod 50, and an eccentric or cam 60 is mounted for rotation on the yoke portion of the member 58 to scat on the top plate 33. The cam 60 has a handle or lever 61 for turnin it. When setting up the form, the hoo s 59 are engaged under the rod 50 and the handle 61 is swung so that the cam 60 raises the member 58, thereby lifting the rod 50 against the upper ends of the slots 51. Furthermore, thc cam 60 bearing on the top plate 33 will clamp said top plate down tightly on the side plate 30.

As shown, the dowel rods 50 are formed with hooks 62 at their ends to engage longitdinal reinforcing rods or bars 63 which are embedded in the sections or slabs of the road, to prevent the rods 50 from pulling loose from said road slabs.

Stakes 64 can also be driven down through the top plate 33 to assist in holding the top plate in place, as well as to assist in holding the entire form in the position. The top plate 33 has a depression 65 with a central aperture 66 for the passage of the stake, and said depression receives the head 67 of the stake flush with or below the upper surface of the top plate '33. The stake 64 will therefore not roject above the form, and will not intere ere with the finishing machine that finishes off the surface of the road while the form is in place.

The form is set up on the sub-base of the road between the rails (not shown) which define the side edges of the road. The side plates 30 are moved downwardly between the uprights 54 of the pedestals with the rods 50 inserted upwardly in the slots 51 to seat in the notches 56 of the pedestals. Said side plates 30 are then separated, which will lock the rods 50 between the notches 56 and the upper ends of the slots 51, to support said rods 50 at the desired distance above the subbase. The stakes 35 are then driven downwardly between the side plates 30 into the sub-base, so that the wedges force the side plates apart, and the prongs 39 also pass down through the apertures 40 and 41, thereby firmly anchoring the form to the sub-base, the prongs 39 as well as the stakes 35 being driven down into the sub-base. The top plate 33 is then positioned on the side plates and the stakes 64 driven down through the apertures 66 until their heads 67 are within the depressions 65. The members 58 are then disposed astride the form and their hooks 59 are engaged under the rods 50. The cams 60 are then t-urned on the top plate 33 to clamp the top plate down on the side plates and to assist in supporting the rods 50.

It is possible to assemble the parts at one side of the road, including reenforcing rods or bars 63 and other reenforcing bars, which constitute the mat, and such mat, including the form, can be quickly lifted over and positioned on the sub-base. The closures 49 can be removed, so that the stakes 35 can be driven into the sub-base, after which the closures 49 are replaced to cover the openings 47. It is thus possible to assemble the form and mat directly on the sub-base, or at one side of the road and then transfer same to the sub-base, whichever is desired, although the latter method provides for greater speed, inasmuch as the forms and mats can be assembled previously so as to be quickly positioned on the sub-base as the road progresses.

The concrete or other material is poured or placed between the usual side rails and the center form, and is finished off flush with the tops of the rails and form, the form remaining in the road during the tamping and finishing olf of the concrete. However, after pouring the concrete, members 58 are removed so as not to interfere with the tamping and finishing operations. Thus, a handle 6l of each cam 6 0 is turned so as to let the meinber 58 move down, and While the concrete is yet soft, the*member 58 is manipulated by hand to disengage the hooks 59 from the rod 50 and to withdraw the member 58 from the concrete. Although the member 58 i,will not interfere with the' pouring of the concrete at the opposite sides of the form, said member is removed to avoid interference with the tamping and finishing of the concrete. The use of the members 58 is especially desired, when the pedestals 52 are not used, in which event the members 58 will serve as the sole support for the dowel rods 50.

The present form divides the road into the opposite side sections or slabs S which are spaced apart to provide a channel or void C between them, and the slabs S have the longitudinal ribs R projecting into the channel C, as seen in Figs. 2 and 3. The Width and depth of the channel depend on the size of the form, and the channel, as shown, extends to the sub-base, the pedestals 52 and base flanges 32 being seated on the sub-base.

After the concrete has set or hardened, the form is removed from between the slabs S. The stakes 64, which hold the top plate 33 down after the members 58 are removed, are Withdrawn, it being possible to engage the extracting claws or other impleme'nts under the heads 67 of the stakes 64 within the depressions 65, so that said stakes can be withdrawn. The top plate 33 is then easily removed and the stakes 35 withdrawn. Then, by pulling upwardly on the bars 45, the toggles are broken upwardly, as seen in Fig. 3, to collapse the form. The side plates 30 are therefore moved together so that they can be readily lifted from the channel, the lower portions of the plates 30 being moved from under the ribs R. The pedestals 52 can then be removed, by swinging the uprights 54 downwardly to overlapping relation over the bases 53, which permit the collapsed pedestals to be lifted out of the channels by raising either end of each base 53 from the sub-base of the road. The reenforcing rods or bars are embedded in the slabs S, with the rods 50 extending transversely across the channel C. The channel is then filled with concrete or other material to form a double hinged joint between the slabs S, asy disclosed in the aforesaid "application, The joint member thus provided between the slabs can also provide a traffic line or marker, and the joint member preferably extends along the center line of lll) the road, although it will be understood that the present device can be used elsewhere and for other purposes, inasmuch as the joint construction can be used transversely of the road, or for floors, platforms, etc. The forms are provided in sections of suitable length, usually ten feet, and the forms are used repeatedly, as will be apparent.

lVhen tlie side plates 30 are curved, as seen 1n Fig. 7, so as to negotiate a sharp curve in the road, the top plate 33 is composed of sections 33 having their ends cut in angular form, as seen in Fig. 7, so that said sections 33a can be disposed at angles relatively to one f another to conform to the curve. The sections 33a are joined togetherby connecting links 68 pivoted to the adjacent terminals of the sections 33 at the lower surface of said sections. The sections 33a have angle irons or flanges 34 to fit the inner surfaces of the side plates 30, as seen in Fig. 8. One of the flexible joints is shown in Fig. 1, and the flexible top plate can be used on straight as well as curved forms.

Fig. 9 shows a different type of collapsible form used for the saine purpose.. The form is composed of three sections, which may be of sheet metal and hollow as shown, or which may be solid. The side sections 30al have the offsets 31u to form the ribs, and the adjacent sides of the sections 30a are inclined and spaced apart, as at 69. yThe intermediate section 70 is of wedge shape, being tapered from its upper to its lower edge, so as to pass down between the sections -30a and separate same to the required distance apart. The stake 64n is driven downwardly through all three sections, thereby holding the sections assembled as well as securing the form on the sub-base, and the left hand sections 30, as seen in Fig. 9, has a depression at the top to receive the head of the stake. Plates 71 extend across the upper and lower edges of the sections and have their ends or edges bent to overlap the sections 30, to assist in holding the sections together.- When the concrete has been poured, the upper plate 71 is removed, and after the concrete has set, the stake 64 is withdrawn. The intermediate section can then be readily withdrawn from between the sections 30. The left hand section 30 can then be shifted toward the right and lifted out of the channel, after which the right hand sectipn 30 can be moved toward the left and lifted out of the channel. The bottoni plate 71 can be left in the road, or may be removed.

Fig. 10 shows a further modification in which only two sections 30b are used, said sections having offsets 31b at their opposite sides. The sections 30b may be hollow., as shown, or solid. The adjacent sides 69" of the sections are inclined and are also curved, as shown, :ind the stake 64b is driven down through both sections, the top of the left hand section 30b having the depressions 65b to receive the head of the stake. The plates 71 in Figs. 1 to 6, inclusive. The side plates 30 have the offsets 31 and base flanges 32. Said 80 plates also have inturned flanges 72 at t eir upper edges on which the top plate 33 se ts, and a channel member 34'is secured in the lower surface of the top plate to fit between the flanges 72. The stakes 35 are driven downwardly betweenthe side plates to cross and contact with the edges of the flanges 32 and inner surfaces of strips 38 secured to the offsets 31. Plates or cross bars 36 are secured to the stakes and have hooks 39 to engage over the upper edges of the plates 38 to prevent the side plates 30 from separating, and to hold said side plates down on the sub-base. The stakes 35 serve as spacers for holding the side plates separated the required distance apart, assisted by the top plate 33.

The top plate 33 has an opening 47 for the engagement of a grab or hand hook, as seen in dotted lines in Fig. 14, for lifting the top plate from the side plates. Said opening 47 is normally closed by a leaf spring 49 secured to the top late beyond said opening and projecting un er the opening. The leaf spring 49 can be depressed 105 or bent downwardly, as seen in dotted lines e in Fig. 14, when engaging a hook through the opening.

The side lates 33 have slots 51c extending -upwardly rom their lower edges to accommodate the transverse dowel rods 50, and slides 54 are carried by the side plates 30 at the inner surfaces thereof to project across the slots 51, for closing the slots to exclude the concrete from the form, and said slides 54 also project under the rods 50 to support said rods. The slides 54 are assembled with the plates 30, said slides having slots 73 receiving rivets or retaining elements 74 secured in the plates 33, and the slides 54 have 120 inturned lugs 75 at their ends to receive the blows of a hammer, sledge or other implement to drive said slides in either direction. The slides 54 are retracted from the slots 51 when inserting the rods 52 in the slots or 125 when removing the plates 30 from the channel in the i'oad.

Fig. A12 illustrates a teinplct used for positioning the stakes 35. The templet com. prises an adjustable spacer bar 76 composed 130 moesen of the sections 77 and 78 having a slidin adjustment. As shown, a clampmg bolt 9 1s engaged through the section 78 and the section 77 has alongitudinal slot 80 receiving said bolt, whereby when the bolt is loosened, the bar 76 can be extended and contracted. The outer extremity of the bar 76 has portions 81 to engage over one side rail, which defines the corresponding side edge of the road, and the inner extremity of the bar is secured to a gage member 82 which seats on the sub-base. Said gage member has notches 83 to receive the stake 35, in order to osition said stake atthe desired distance rom the side rail. B driving the stake down into the ground until the plate or bar 36 strikes the top of the member 82, the stake will be in a position for the assemblage therewith of the side plates 30, the strips 38 being engaged inwardly and upwardly into the notches or hooks 39. After the dowel rods 50c are positioned in the slots` 51c and the slides 54 project across the slots to close the slots and support the rods, the top pla-te 33 is then placed on the side plates, andthe concrete can then be poured. By use of the temlet, the stakes can be driven into the subase first, and the side plates can then be assembled with the stakes, which will position the form properly on the sub-base.

Fig. 15 shows the side plates 30d having the offsets 31d and base flanges 32d, and the top or cover plate 33d has downturned flanges 34d at its edges to overlap the side plates at the outer surfaces of the'side plates. Stakes or prongs 39d are driven downwardly through apertures 40d in the offsets and apertures 41d in the flanges 32d, to support the side plates in position, and the upper ends of each pair of stakes or prongs are connected by a yoke or cross bar 36d, to space the side plates apart the proper distance, the two stakes or prongs being driven down simultaneously. The side plates also have the slots 51d extending u wardly from their lower edges to receive t e transverse dowel rod 50, and a pedestal 52d is provided having the base 53d under the flanges 32d, and the uprights 54d provided with notches 56d in which the rod 50d is seated to support said rod. The pedestal 52d is composed of one piece of sheet metal, and remains in the road. s

A templet is also shown for positioning the' form, said templet comprising an adjustable t spacer bar 76d composed of the sectlons 77l and 78, a clamping bolt 79d being carried by the section 78l anden aging in a longitudinal slot 80d with whiclga the section 77l is provided. The section 78d has the portions 81" to engage the corresponding side rail, and the section77d has a pin or lug 82d to engage in a hole or aperture 83l in the top late 33. In this way, the form can be rea 'ly positionedat the desired distance from the correspondmg side rail.

Fig. 16 illustrates even a more simple con-I struction, and the side plates 30 and top plate 33 can be of wood. The side plates 30 have outstanding ribs 31 to form ooves in the adjacent edges of the road slabs lnstead of tongues as hereinbefore described, and it will be understood that the present apparatus can be used to produce either tongues or grooves in the road slabs. Stakes 35 are driven down in the sub-base to space the side plates 30 apart, and said stakes support the top plate 33, The side plates have the slots 51 to receive the dowel rods 50, and the edestals 52 have their uprights 54 forme to fit snugly against the side plates. The uprights 54 have the notches 56 to engage and support the rods 50. When the concrete has set, the top plate 33 is removed, after which the ystakes 35 `are removed, permitting the side plates 30 to be moved inwardly and lifted out of the channel. The pedestals 52 can be left in the road, or may be removed, by springing the uprights 54 inwardly and swing thel pedestals 52 upwardly around the rods. The

pedestals 52 support the side plates and also hold them against separation, while the stakes 35 prevent the side plates from being moved toward one another.

Fig. 17 shows the side plates 30t hinged to the top plate 33, with toggle links 42" connecting side plates near their lower edges to hold the side plates apart. In order to operate the toggle, a screw connection between the toggle and top plate 33t is provided, comprising a screw 84 swivelled for rotation in the top plate and screw-threaded into a sleeve 85 connected with the joint of the to gle links 42'. The screw 84 has its upper en s uared, as at 86, within a depression 87 of .t e top plate 33', for the en agement of a wrench or other implement. y turning the screw 84, the sleeve 85 can be raised to break the toggle connection and swing the side plates 30t toward one another,.as seen in dotted lines, for removing the form, and en the screw 84 is rotated inthe opposite direction to move the sleeve 85 downwardly, the tog le connection is straightened out to swing t e side plates apart. v

Fi 18 shows the side plates 305 as hinged togetlxer at their lower edges and divergln apart upwardly to form a V-shaped channe said side. 'lates having offsets 31g. A pedestal 88 is use for supporting the side plates and comprises a base 89 having the uprights 90 yformed with the V-shaped slots 91 to receive the side plates. A spacer 33'g is positioned be- /tween the side plates to hold them separated.

This modification also shows the offset 318 as extending outwardly instead of inwardly to form grooves in the road slabs.

The offsets with which the*` opposite side plates or members of the form are provided, may beof angular or arcuate cross section, and said offsets or deformed portionacan also be of different shapes and arrangements, to form ribs, lugs or other protuberances on the slabs, or grooves, recesses or other cavities therein, in order to lock the joint member between the slabs against vertical and longitudinal movements, and to provide the double joint which allows for flexing action between the road and slabs.

Having thus described the invention, what is claimed as new is y n 1. A form for producing a channel in a concrete road or similar surfacing structure comprising side members spaced apart and adapted to be collapsed toward one another for removal from a channel defined by said members between sections of such structure, said members being adapted to bear on a subbase and having offset `portions between and spaced from their upper and lower ed es in order to deform the adjacent sides o said sections between the upper and lower surfaces of said structure.

2. A form for producing a channel in a concrete road or similar surfacing structure comprising side members spaced apart and adapted to be collapsed toward one another for removal from a channel dened by said members between sections of such structure, said members being adapted to bear on a subbase and having offset portions between and spaced from their upper and lower edges in order to deform the adjacent sides of said sections between the upper and lower surfaces of said structure, and means for holding said members in spaced relation.

3. A form for producing a channel in a concrete road or similar surfacing structure comprising side members spaced apart and adapted to be collapsed toward one another for removal from a channel defined by said members between sections of such structure, said members being adapted to bear on a subbase and having offset portions between and spaced from their upper and lower ed es in order to deform the adjacent sides o 'said sections between the upper and lower surfaces of said structure, a top plate removably disposedon said members between the upper edges thereof and spacing said ymembers apart, and means below said top plate connecting said members for limitin the separation thereof and assisting said p ate in Yspacing'said members apart.

4. A form for producing a channel in a concrete road'or similar surfacing structure comprising side members spaced apart and adapted to be collapsed toward one another for removal from a channel defined by said members between spaced sections o said structure, said members being adapted to bear on a sub-base and having longitudinal offsets between and spaced from their upper and lower ed es in order to deform the adjacent sides 0% said sections between the upper and lower surfaces of said structure.

5. A form for producing a channel in a. concrete road or similar surfacing structure comprising side members spaced apart and adapted to be collapsed toward one another for removal from a channel defined by said members between spaced sections of said structure, said members bein adapted to bear on a sub-base and having ongitudinal offsets between and spaced from their upper and lower edges in order to deform the adjacent sides of said sections between the upper and lower surfaces vof said structure, and means for connecting said members and spacing them apart a predetermined distance.

6. A collapsible form of the character described comprising opposite side members spaced apart and adapted to be collapsed to- Ward one another for removal from a channel defined by said members between sections of such structure, said members having offset portions between and spaced from their upper and lower edges in order to deform the adjacent sides of said sections between the upper and lower surfaces of said structure, and means for spacing said members apart and staking them on a sub-base.

7. A form for producing a channel in a concrete form or similar surfacing structure, comprising side members spaced apart and adapted to be collapsed toward one another for removal from a channel defined by said members between spaced sections of said structure, said members having longitudinal offsets between and spaced from their upper and lower edges in order to deform the ad- 100 jacent sides of said sect-ions between the upper and lower surfaces of said structure, and means for spacing said members apart and staking them on a sub-base.

8. A form of the character described com- 105 prising opposite side members, and spacing means for connecting said members including spaced stakes to engage said members.

.9. A form of the character described comprising opposite side members, stakes to en- 11o gage Said members and enter the sub-base, an a connection between said stakes for spacing said members apart.

10. A form of the character described comprising opposite side members having offsets, 115 stakes to pass through said offsets down into the sub-base, and a connection between said stakes for spacing said members apart.

11. A form of the character described comprising opposite side members having offsets 120 between their upper and lower edges, and a member for spacing said members apart `having portions to en age through said o'sets.

12. A form of tie character described comprising opposite side members, a stake to be 125 driven into the sub-base between said members, and means carried by the stake to engage said members and hold them in relative spaced position.

13. A form of the character described com- 130 prising opposite side members, strips carried by said members between their upper and f having a wedge portion to. contact with saidv lower edges and havingupstanding edge portions, and members engageable over said edge portions ofthe strips for spacing the si` e membersa art.

14. A form of the character described comprising opposite side members, strips carried by said members between their upper and lower edges and having -upstanding edge portions, stakes to be driven down into the subbase between said members, and hooks carried by said stakes to engage over Said edge portionsfor spacing the side members apart.

15. A form of the character described comprising opposite side membershaving offsets, a stake to be'driven into the sub-base between -said members, and secondary stakes carried flanges to force said members apart.

18. -Aform ofthe character described comprising opposite side members, a stake to be driven into the sub-base between said members and having a wedge portion, said members having portions between their upper and lower edges for the contact of said wedge portion ,to-A separate said members when the stake is driven down. A

` 19. A form of the character described comprising opposite side members having inturned base flanges, a stake to be'driven'into the sub-base between said members and having a wedge portion to contact with said flanges for separating the lower edges of said members, said members having portions between their upper and lower edges'for the contact of said wedge portion to separate the yupper ed es ofl said members.

20. A orm of the character describedb/dmprising opposite side members having offsets f and inturned base fianges, a stake to be driven into thesub-base between said members, a

wedge `portio'nf'eamried by the stake to pass between said offsets and flanges for separat# ing said members,.and secondary stakes cartions, a stake to be driven into tle sub-base between said members, a plate carried by the stake having a wedge portion to move down between the strips and flanges for separating said members, said plate having downwardly extending secondary vstakes to pass down through said offsets and flanges and forming hooks to engage over said edge portions of the strips.

22. A form of the character described comprising opposite side members having offsets between and spaced from their upper and lower edges and slots extending upwardly from their loweredges into said offsets for receiving a transverse dowel rod.

A form lof the character described comprising opposite side members having slots extending upwardly from their lower edges for receiving a transverse do-wel rod, and means for closing said slots.

A form of the character describedcomprislng opposite side members having-slots extending upwardly from their lower edges for receiving a transverse dowel rod, and

members to extend across said slots for closing them and supporting said rod.

25. A form of the character described comprising opposite side members, and a base. to be disposed under said members and having foldable portions to limit the separation of said members.

26. Aform of the character described comprising opposite side members, and a pedestal for supporting said members including a base to be disposed under said members and uprights forlimiting the separation of said members, said base and uprights being connected to fold together. i

27. `A form of the character described comprising opposite side members, and a pedestal including a base to be disposed under said members and uprights formed to fit the outer surfaces of said members to limit the separation of said members, and adapted to be moved toward one another when the Aside members are removed. 28. A form of the character described com prising opposite side members, a base member to be` disposed under said side members, and having portions extending upwardly to bear vagainst the outer surfaces of said side members to limit the separation of said side members, and a removable spacer member to be disposed between the members for separating them.

, prisin exten ing upwardly from their lower edges for receiving a transverse dowel rod and a pedestal including a base to be disposed under said members and uprights to be disposed at the opposite sides of said members across said slots and to support said rod, said uprights bein shaped to fit the outer surfaces of said mem ers so that the pedestal can be removed from a channel definedby'said members.

33. A form of the character described com prising opposite side members, and a pedestal including a base to be disposed under said members and uprights to be disposed at the opposite sides of said members for limiting the separation thereof, said uprights vbeing shaped to fit the outer surfaces of said members so that the pedestal can be removed from a channel defined by said members. y

34. A form of the character described comprising opposite side members, and a pedestal including a base to be, disposed under said members and uprights 1go be disposed at the opposite sides of said members, said uprights being foldable toward the base for the removal of the pedestal from achannel defined by said members.

35. A form of the character described com prising opposite side members, and a pedestal comprlsing a base to be disposed'under said members, and uprights hinged to said base to f be disposed .against the opposite sides of said members.

36. A form of the character describedcomprising opposite side members having slots extending upwardly from their lower edges for receiving a transverse dowel rod, and a pedestal including a base to be disposed under said members and uprights hinged to the base and shaped to fit the outer surfaces of said members for limiting the separation of said members, said uprights extending across said slots and having portions to engage said rod for supporting the rod Ala-ndholding the` uprights against said members.

37. A form of the character described comprising opposite side members having slots extending upwardly from their lower edges for receiving a transverse dowel rod, a top plate on said members, and sina le means for simultaneously supporting sai rod in said slots and clamping said top plate down on said members.

38. A form of the character described comprising opposite side members having slots extending upwardly from their lower edges to receive a transverse dowel rod, a top plate on said members, a U-shaped member to straddle said(plate and members and having terminal hooks to engage said rod for supporting the rod, and adjustable means carried by the last named member to bear on the top plate for raisin said member.

39. A form o the character described comprising opposite side members having slots extending upwardly from the lower edges to receive a transverse dowel rod, an inverted U- shaped member to straddleaid top plate and members and having terminal hooks to engage under said rod for supporting the rod,

and a cam mounted on said U-shaped member to bear on the top plate.

40. A form of the characterdescribed comprising opposite side members, a top plate thereon, and a stake to be driven down into the sub-base between said members, the top plate having a depression to receive the head of the stake and provided with an aperture for the passage of the stake.

4l. A form of the character described comextending toward one another, and toggleconnections between said membcrsfoj spacing them apart and movmg them toward one another, sald.` toggle connections having links ofldierentlengths to offset said an'ges whenv the side members" are moved toward .one another. Y,

44. A foi-in of 'the charac-ter described comprising opposite side members having iianges projecting toward one another, toggle links of diferent lengths connecting said members, 1

andmeans connected to said links for operating them.

In testimony whereof I hereunto aiiix my signature.

JOHN N. HELTZEL. 

